(5) Plant Responses
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9 Terms
How do auxins control the balanced growth of a plant?
More shoots → ↑ auxin → ↑ increases root growth
What is phototrophism?
growth toward light
Gravitropism
growth in response to gravity
Thigmotropism
growth in response to touch
How do cytokinins control the balanced growth of a plant?
More roots → ↑ cytokinins → ↑ increases shoots growth
What are pulvini?
Swollen joints at the base of leaves
Control movement by changing turgor pressure
What is a phytochrome?
Acts as an on/off switch for plant responses
Detects red (660 nm) and far-red (730 nm) light
What is photoperiodism?
controls flowering (short-day vs. long-day)
What is the difference between a long-day and a short-day plant?
Short-day plants → flower when night is long (>12 hrs)
Long-day plants → flower when night is short (<12 hrs)